Don't buy escs that don't transmit power. You need 3 cables coming out not 2.
It's really hard to find the multiwii download.
Link takes you to archive page on google code.
Need to manually go to
https://code.google.com/archive/p/multiwii/
And right click download from the front page.
And you need to install USB drivers:
https://www.silabs.com/products/mcu/Pages/USBtoUARTBridgeVCPDrivers.asp…